sorry im on about gear box ,2a and 3 steering boxes have different shafts which have 1 of box bearing surfaces machined on shaft ,whereas the rest is the same it means you cant fit old series shaft and column to new or recon series 3 box ,anything but series 3 is old stock dealers only and pricey ,as said shaft needs changing as nearly allways has worn bearing surface ,i have cut and welded different shafts to make an early box out of later ,hardest part of removal is drop arm on box